//
//  Copyright (c) 2018. Uber Technologies
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

import Foundation
import NeedleFoundation
import RxSwift
import UIKit

extension ObservableViewController: PluginizedScopeLifecycleObservable {

    public func observe(_ observer: @escaping (PluginizedScopeLifecycle) -> Void) -> ObserverDisposable {
        let disposable = lifecycle
            .subscribe(onNext: { (event: ViewControllerLifecycle) in
                switch event {
                case .deinit:
                    observer(.deinit)
                case .viewDidAppear:
                    observer(.active)
                case .viewDidDisappear:
                    observer(.inactive)
                }
            })
        return NeedleDisposable(disposable: disposable)
    }
}

private class NeedleDisposable: ObserverDisposable {

    private let disposable: Disposable

    fileprivate init(disposable: Disposable) {
        self.disposable = disposable
    }

    fileprivate func dispose() {
        disposable.dispose()
    }
}
